Funding for this research was provided by:
National Research Foundation of Korea (R2015431)
Article History
Received: 20 July 2020
Accepted: 15 September 2020
First Online: 23 September 2020
Compliance with ethical standards
:
: The authors declare no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
: This study was approved by our institutional ethical review board and was conducted in accordance with the ethical standards and with the 1964 Declaration of Helsinki and its later amendments.
: Written informed patient consent was obtained.
: Written informed patient consent was obtained.